No
If the Zune software is compatible with Mac OS, then yes; simply install as directed. However, if it is not compatible, you may either need to find and use a Micorsoft Windows computer or install BootCamp Windows XP onto your MacBook if it meets the requirements of installing Windows onto it.
The operating systems that are compatible with Adobe software include Windows 7, Windows 8, Mac OS X, Mac OS X Snow Leopard and Mac OS X Mountain Lion.
Omnigaffle is a charting software, similar to Microsoft Visio. Omnigaffle is compatible with Apple devices: Mac OS X Leopard, Mac OS X Snow Leopard, Mac OS X Lion and iOS (iPad).
Technically it won't connect, unless you have a Windows OS running on your Mac. There are ways to get around this I believe, such as third-part software.
Difficult to put an exact figure on the number of software titles compatible with OS X. It will probably run into the millions. Most of the major software developers (such as Microsoft and Adobe) have their own Mac developers working on Mac software. Then there are countless smaller developers producing software for Mac OS X. (See links below for an idea of the range)
Yes you can: Mac OS X 10.5 with Boot Camp 2.0
There are several emulators to run other systems software on Windows, but there is nothing decent (as in working reliably with any software) for running Mac OS X software on Windows.
Office 2010 is compatible with Windows 8 running on a Mac. It is not compatible with any Mac OS.
Yes, the Elgato Game Capture HD comes with its own software for Mac OS X 10.7 or higher.
The Lumix DMC-G2 is compatible with Mac OS X 10.4.11 and the manual describes using it with a Mac. To get the best from it the Mac should have USB 2 sockets; older Macs may have slower USB 1 sockets, and it should be able to run suitable software; the latest versions of which may not be compatible with Mac OS X 10.4.11.
The current version of Airport Utility 5.4.2 and it is fully compatible with Mac OS X 10.6 (Snow Leopard). The latest versions of all Apple software can be installed by selecting Software Update... from the Apple menu.
Both Apple and IBM are large international companies offering a wide range of software and hardware. IBM has a range of software for Mac OS X such as their Lotus Symphony but they have discontinued other titles such as their XL C/C++ Compiler Advanced Edition for Mac OS X.